tutorial 3 heat transfer question 2

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Heat Transfer Ch3 Tutorial

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3-48 A l-mm-thick copper plate (k = 386 W/m-K) is sandwiched between two 7-mm-thick epoxy boards (k =0.26 W/m-K) that are 15 cm X 20 cm in size. If the thermal contact conductance on both sides of the copper plate is estimated to be 6000 W/m-K, determine the error involved in the total thermal resistance of the plate if the thermal contact conductance are ignored.